Rotary pump, motor, or engine



June 3, 1924 l,496,737

P. C. PETERSEN ROTARY PUMP, MOTOR, OR ENGINE Filed June 3, 1922 2Sheets-Sheet 1l Z7 Z ZZ f-w /9 6 W l// /A f E sii /l im i Jun@ 3, 1924.1,496,737

- P. C. PETERSEN ROTARY PUMP, MOTOR, OR ENGINE Filed June 5, 1922 2Sheets-Sheet 2 gmantoz Fferfeiv,

@ Mw; @im

Patented .lune 3, 1924.

1,496,13 oFFlc.

C. PEIIERSEN, OF CEDAR-FALLS, IOWA, ASSIGNOR TO VIKING PUNT COMP OFCEDAR FALLS, IOWA.

ROTARY PUMP, MOTOR, OR ENGINE.

` Application led June 3,

To all whom t may concern.'

Be it known that I', PETER C. PETERSEN, citizen of the United States,residing at Cedar Falls, in the county of Black Hawk and State of Iowa,"have invented certain new and useful Improvements in Rotary Pumps,Motors, or Engines, of which the following is a specificatlon.

This invention relates to improvements in rotary pumps, motors orengines and more articularly to that type of such mechanism including apinion meshing with a rotor.

' The primary object of the invention is to improve structurally thedetails of certain features of apparatus shown in known prior patentsand to provide improved elements capable of rendering the knownconstructions more practical.

A further object of the invention is to provide an improved pump, motoror engine that has a larger capacity for its size and is more durableand eicient; especially when pumping against highpres'sures.- l

With the foregoing objects outlined and with other objects in view,which will appear as the description proceeds, the invention consistsinthe novel features hereinafter described in detail, illustrated in theaccompanying drawings and more particularly pointed out inthe appendedclaims.

Referring to the drawings:

Fi re 1 is a vertical ongitudinal sectiona view of a pump constructed inaccordance with the present invention. tiona view of the same.

Figure 3 is a transverse vertical sectional view taken through the inletand outlet ports. -o

40 Figure 44 is a perspective view of one of the heads or end platesviewed on the inner side.

Figure 5 isa side view of the rotor. In the drawing, 1 designates acasing hav- @5 in a circular inner surface 2. An inlet port 3 1sprovided at one side of said casing and an outlet port 4 is varranged atthe opposite side of .the same. An abutment 5 1s arranged within thecasing between said ports. The inner ends of the ports are enlarged asshown at 3 and 4". 'p

Two heads 5 of identically similar structure are provided for closingthe ends of the casing and for other purposes as hereinafter described.A drlve shaft 6- is provided, and

Fi re 2 is a horizontal longitudinal sec-k l 1922. Serial N0. 565,602.

this shaft is mounted'in sleeve bearings 7 forming part ofthe heads.lThis shaft carries a spur pinion 8 which internally actuates a gearrotor 9. These elements together constitute and comprise a rotary pumpof the internal gear type.

The two heads that close the ends of the casing, as before stated, aresimilar in con' struction and each consists of a flange or disk 10provided with apertures 11 to re- 65 ceive bolts 12 employed in securingthe head i to the casing. Extending inwardly from the disk is an annularshoulder 13 that fits for a short distance inside the casing in order toprovide an absolute and perfect centering of a stub-shaft 14, in thecasing 1. A suitable packing can be interposed between the ange 10 andthe end of the casing 1. A cylindrical reduced ortion or stub shaft 14projects inwardly rom the shoulder and serves as a part of the shaftwhich carries the rotor. A crescent-shaped `projection 15 extends in-'hwardly from said reduced portion, and is of such length that thecrescente of vthe two heads, to end, and thus form one crescent-shapedmember centrally located in the casing with reference to its length. Itwill be noted that the outer surface of the crescent forms a con- Atinuation of thesurface of the stub shafts S5 14, and the rotor moves onthe stub. shafts and on the outer surface of the crescent.

Each of the heads carries one of the bearings 7 for the drive shaft andthis bearing is o centerv relatively to thejl'ongitudinal e0 axis of thecasing 1, but it centers with the inner surface of the crescent 15 andalso with the inner 'surface 16 of the abutment 5 at a point midwaybetween the ports. In other words, the inner surface of the crescent anda5' this point orlongitudinal line on the abutment are in a circle drawnfrom the axis of Ythe drive shaft. v l

The drive shaft 6 asses through both heads and one of said heads isrovided loo with a stuiling box 17 for the sha 6, the shaft projectingthrough said stuing box and being provided on the outside with 'theusual means (pot shown) 4.for applying powerl to said s aft. The bearing7 on the 105 other head may be closed at its outer end and both bearinma have the\ usual means (not shown for liibrication.

For heavy duty, the shaft may be ex l tended further outside ofthe headsto move tno when placed in the casing, meet end in bearings of any type,such bearings to be mounted on standards, with the casing between them,on a common base. Tn this form both heads are provided with studingboxes. Tt is understood that these last mentioned features are common inthe art.

The drive shaft and pinion 8 may be made integral, or the pinion may befastened to the shaft in any suitable manner. Tt will be noted that thepinion has teeth 18 that have concave sides 19, that is, they `arethicker near their outer ends than they are about halt way in towards`the hub. The corners 20 on the outer end portions of the teeth areslightly rounded as shown. This shape of the teeth furnishes means forinsuring a good contact with the convex cogs, hereinafter described, ofthe rotor and tur- -ther insures a free and easy movement, slightfriction and nearly noiseless running even at high speed.

The spaces 21 between the teeth are cut deeper towards the hub than issuiicient to give room for the cogs of the rotor. This construction isprovided in order to permit the slight amountof, fluid impinged betweenthe teeth ofthe pinion and the cogs of the rotor, when both are at theabutment 5, a free chance to move from one side of a cog to the otherside of the latter, and thus avoid undue friction and possiblewater-hammer.

The rotor 9 is preferably constructed of two similar parts 22, eachhaving cogs 23 of suitable length extending from a'. ring 24 that servesas a bearing for the rotor on the reduced portions or stub shafts 1li.The cog portion of the rotor travels on the outer side of the crescent15. llt will be noted that the cogs 23 of the rotor have convex sides 25which, as beforestated, are adapted to engage the concave sides 19 ofthe teeth of the pinion. The cogs of the two parts 22 of the rotor arejoined and match end to end, as shown, and are fastened together by anysuitable securing means, such as bolts, screws, rivets or the like, 26,in a practical manner to form one unitary element with the cogs 23 inthe central partwith reference to the length of the rotor, and'v'a ringor main bearing ortion 24 at each of its ends. The peri liery oftherotor is in slidable contact wit the inner surface 2 ot the casing.

The enlarged ends 3a and d ot the ports 3 and 4 extend the full lengthof the spaces between the cogsV 23, and'also extend circumferentially sothat abouttwo spaces in the rotor are always open to each port, all thefluid must pass in and out through the spaces in the rotor as the rotorrevolves, therefore, there must be adequate space between the rotor andthe casing at the ports.

llt is obvious from the tore oing that in asmuch as the rotor isentirely enclosed in the casing between the heads, and the shaft Meara?'has bearings ot equal diameter in both heads, and the inlet and outletorts are located on the sides of the casing, t ere is no end thrustwhatever in this machine.

Tn operation either port 'may be inlet or outlet depending only on thedirection in which the shaft 1s turned.

Fluid is drawn into the rotor 9 through the spaces between the cogs inthe same, when the teeth 18 of the pinion by revolving said port to portexcept along with the teeth and cogs past the crescent. l

Tt will be noted that the meeting ends ot the cogs are provided withtongue and groove joints 27 in order to prevent any independent movementbetween cogs which abut one another.

From the foregoing, it is believed that the construction, operation andadvantages ot the invention may be readily understood by those skilledin the art, and it is obvious that various changes may be made indetails illustrated without departing from the s irit o1? the inventionas expressed in the-clalms.

What is claimed and desired to be secured by Letters Patent is 1. Tncombination, a casing member provided with a cylindrical inner surface,an annular open-ended rotor arranged in said casing provided withradially disposed longitudmal slots and cogs and having its peripheryslidably engaging the inner surface of the casing, a shaft extendingthrough said MID casing and having its axis arranged on cen= terrelatively to the axis of the rotor, a pinion on said shaft having teethadapted to extend through said slots and engaging said rotor, cogs,substantially identical head members lll@ detachably connected to theends of the casing member and each provided with aninwardly extendingcrescent-shaped elementl engaging the inner surface of said' rotor,said' crescent-shaped elements having theirI ends arranged opposite andin close proximity to one another, an inlet port extending through oneof said members, and an outlet vided with a stubv shaft projecting intoandforming 'an inner bearin for said rotor, and carrylng the crescent-saped element, the outer surface of sald crescent-shaped element Iforming a continuation of the outer surface than they are about half wayto the hub, and

and each provide each tooth being provided with rounded corners fromside to end.

'5. A combination as claimed in claim 1 in which the rotor cogs haveconvex side surfaces, and in which the pinion teethhave concave sidesurfaces adapted to contact with the side surfaces of the cogs.

6. In combination, an open ended casing providedl with inlet and outletports at its op osite sides and/having a substantially circu arinnersurface, 'an annular open-ended driven rotor arran ed in said casing andslidably engagin t e inner surface ofi the latter, said rotor avingrings at its ends and being rovided with radial slots and cogs intermeiate its ends, said cogshaving convex sideSuraceS, a pinion arranged insaid casing and rotor and having teeth adapted to roject through saidslots and provided wit concave side surfaces adapted to contactwith theconvex sides of the cogs in said rotor, a driving shaft fixed to saidpinion, and heads closln the ends of said casing d with an inwardlyextending'stub shaft terminating in a crescentshaped memher arrangedbetween said peimon and said rotorand forming an inner aring for the'rotor.

7 In a machine of rotor consisting of an open-ended hollow barrel withspaces cut out longitudinally in oints.

the class described, al

the central part forming -cogs between, and. said cogs bemg joinedtogether at each end by a ring,l said rotor being formed of two similarparts, and the meeting ends of said cogs being provided 'with tongue andgroove 8. A machine of the class described including a casing ofsubstantially cylindrical shape provided at opposite sides of itsperiphery with inlet and outletports, a support for said casing, theinterior of said' casing and the inner end of said support forming acylindrical surface, an annular open-ended rotor arranged in said casingand engaging said cylindrical surface throughout the length of therotor, said l rotor consisting of end rings each having spaced cogsprojecting from one side thereof, and means connecting the cogs of thetwo rings together, detachable end plates for said casing, each endplate having a cylindrical shoulder engaging the cylindrical surface ofthe casing` and support, a smaller cylindrical shoulder projectinginwardly from'the rst mentioned circular shoulder, engaging one of therings of the rotor, and forming an inner bearing for the latter, acrescent-shaped member integralwith the smaller circular shoulder andengaging the inner surfaces of certain of lsaid cogs, each of said endplates being provided with an eccentrically'l arranged bearing aperture,the' 'inner surface of each of said crescent-shaped members being on thearc of a circle having 75 its center at the axis of said bearingaperture, and a pinion engaging said cogs and the inner surfaces ofl thecrescent-shaped v members and provided with a shaft extending throughsaid bearing aperture.

In testimony whereof I aiiix m signature.

PETER C. PE ERSEN.

